As stated, it's free. Some rides and attractions are fee based. When I was there the shuttle exhibit was free after 1 or 2. Not sure if it's the same every day, or how much it costs when not free. We were there on a Tuesday.
It's free but some exhibits do cost money
It's free but some parts do cost money.
King Tut had Groupons available for $15 or so once the initial packed crowds waned. Onsite parking is $20.
There are some exhibits that cost extra once you are there
Its free except if your their to be part of any special convention that might be going on.
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